Lightning-ignited Grand Canyon wildfires burn tens of thousands of acres, as NOAA’s GOES satellites continue to monitor the fires.

See the 2,500 mile-long (4000 km) Valles Marineris in imagery captured the Mars Reconnaissance Orbiter. Global topography: NASA/GSFC CTX global mosaic: NASA/MSSS/Caltech/ CTX topography: NASA/MSSS ...

The Google Maps team went to the Grand Canyon and took more than 9,500 images to create a Street View map of the national park. After four months of stitching all those high-resolution pics ...

Arizona's Grand Canyon may be awe-inspiring, but it's just "a scratch" compared to the Valles Marineris Canyon on Mars, new photos reveal.